.header, .container, .footer {
    width: 95%;
    margin: 10px auto;
}

.header{
    height: 200px;
    background-color: black;
    color: white;
}
.container{
    height: 900px;
    background-color: bisque;

}
.footer{
    height: 350px;
    background-color: darkblue;
}

#catalog th{
    font-weight: bolder;
    color: white;
}

#catalog{
    width: 100%;
}
#left{
    width: 20%;
    height: 100%;
    float: left;
    background-color: aqua;

}
#left{
    width: 79%;
    height: 100%;
    float: right;
    background-color: cornsilk;
}